Optical Gyroscope Weak Measurement Amplification Readout
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Solution Overview
Problem
Current inertial measurement units (IMUs) are not adequately miniaturized for widespread use in navigation, particularly in GPS-denied environments, and existing optical gyroscopes lack the precision and noise reduction needed for advanced navigation applications.
Innovation Solution
The development of integrated optical gyroscopes using weak value amplification (WVA) and inverse WVA techniques, which involve a chip-scale photonic device with a ring resonator and readout structure, enhancing signal-to-noise ratio and achieving precise rotation detection by amplifying small signals through controlled light manipulation in microscale waveguides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical gyroscopes are used, then basic rotation detection is achieved, but measurement precision is insufficient for advanced navigation applications
Solution Approach 1:
The patent introduces a readout structure as an intermediary component that couples to the ring resonator. This readout structure includes waveguides and beam splitters that facilitate the extraction and amplification of weak optical signals. The intermediary readout structure enables precise rotation detection by converting subtle phase changes in the ring resonator into measurable intensity variations, thereby resolving the contradiction between measurement precision and signal-to-noise ratio.
Solution Approach 2:
The patent employs weak value amplification technique that involves changing the parameter of the optical system by introducing a strong coupling between the ring resonator and readout structure. This parameter change amplifies the weak optical signals generated by rotation, enhancing the signal-to-noise ratio while maintaining measurement precision. The system exploits the sensitivity of the ring resonator to rotation-induced phase changes and amplifies these signals through controlled optical coupling.
2Volume of moving object
If miniaturized IMUs are developed, then device size and power consumption are reduced, but measurement precision deteriorates
Solution Approach 1:
The patent replaces conventional mechanical inertial sensors with an integrated optical gyroscope based on ring resonators and waveguides. This substitution enables miniaturization while maintaining or improving measurement precision through optical interference effects. The chip-scale photonic device uses light waves instead of mechanical components, allowing for compact form factor with high precision rotation detection capability suitable for modern navigation applications.
3Reliability
If weak measurement amplification is implemented, then signal-to-noise ratio improves, but device complexity increases
Solution Approach 1:
The patent merges the ring resonator and readout structure into an integrated chip-scale photonic device. By combining these components through optical coupling, the system achieves weak measurement amplification without proportionally increasing device complexity. The merged structure allows the readout to directly tap into the resonator's output, simplifying the overall architecture while maintaining high signal-to-noise ratio through the amplification effect.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in a significant improvement in rotation precision, achieving one to two orders of magnitude better signal-to-noise ratio and reduced error noise, enabling applications such as platform stabilization, tactical navigation, and aeronautics with precision of 0.01°/h and bias stability of 0.005°/h.
Implementation Method 1
The ring resonator introduces a relative phase shift between the light in the lower waveguide traveling in the reverse direction and the light in the upper waveguide traveling in the reverse direction
Implementation Method 2
splitting, at a beam splitter, the light between a lower waveguide and an upper waveguide
Implementation Method 3
spatially phase tilting, by one or more spatial phase tilters, one or both of the light in the lower waveguide and the light in the upper waveguide
Data Source
AI summary
A photonic device for detecting rotation and a corresponding method for operation thereof are disclosed. The photonic device includes a readout structure coupled to a ring resonator at one or more coupling points. Light is split between a lower waveguide and an upper waveguide of the readout structure in a forward direction at a beam splitter. The light in the waveguides traveling in the forward direction is coupled into the ring resonator and subsequently back into the waveguides in a reverse direction. The light is spatially phase tilted and is combined at the beam splitter. The combined light is detected by a split detector.